#include<iostream>
#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include <fcntl.h>
#include<thread>

using namespace std;

int main(int argc,char **argv){

   cout<<"cpu num is: "<<thread::hardware_concurrency()<<endl;



   return 0;
}